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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale securities |  |
Fair value, less than 12 months | $ 50,394 | $ 111,648
Unrealized losses, less than 12 months | 237 | 886
Fair value, 12 months or longer | 639,407 | 1,109,535
Unrealized losses, 12 months or longer | 7,535 | 31,256
Fair Value | 689,801 | 1,221,183
Unrealized Losses | 7,772 | 32,142
Held-to-maturity debt securities |  |
Fair value, less than 12 months | 1,290 | 13,107
Unrealized losses, less than 12 months | 1 | 33
Fair value, 12 months or longer | 0 | 125,128
Unrealized losses, 12 months or longer | 0 | 1,189
Fair Value | 1,290 | 138,235
Unrealized Losses | 1 | 1,222
U.S. Treasuries |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 278 |
Unrealized losses, less than 12 months | 2 |
Fair value, 12 months or longer | 0 |
Unrealized losses, 12 months or longer | 0 |
Fair Value | 278 |
Unrealized Losses | 2 |
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 0 | 21,660
Unrealized losses, less than 12 months | 0 | 183
Fair value, 12 months or longer | 149,248 | 449,141
Unrealized losses, 12 months or longer | 260 | 7,370
Fair Value | 149,248 | 470,801
Unrealized Losses | 260 | 7,553
Held-to-maturity debt securities |  |
Fair value, less than 12 months |  | 4,980
Unrealized losses, less than 12 months |  | 9
Fair value, 12 months or longer |  | 125,128
Unrealized losses, 12 months or longer |  | 1,189
Fair Value |  | 130,108
Unrealized Losses |  | 1,198
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 5,817 | 11,971
Unrealized losses, less than 12 months | 8 | 19
Fair value, 12 months or longer | 5,021 | 49,756
Unrealized losses, 12 months or longer | 27 | 914
Fair Value | 10,838 | 61,727
Unrealized Losses | 35 | 933
Held-to-maturity debt securities |  |
Fair value, less than 12 months | 1,290 | 8,127
Unrealized losses, less than 12 months | 1 | 24
Fair value, 12 months or longer | 0 | 0
Unrealized losses, 12 months or longer | 0 | 0
Fair Value | 1,290 | 8,127
Unrealized Losses | 1 | 24
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 23,908 | 16,854
Unrealized losses, less than 12 months | 184 | 22
Fair value, 12 months or longer | 73,414 | 96,247
Unrealized losses, 12 months or longer | 1,349 | 3,710
Fair Value | 97,322 | 113,101
Unrealized Losses | 1,533 | 3,732
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 20,391 | 61,163
Unrealized losses, less than 12 months | 43 | 662
Fair value, 12 months or longer | 409,292 | 512,216
Unrealized losses, 12 months or longer | 5,831 | 18,937
Fair Value | 429,683 | 573,379
Unrealized Losses | 5,874 | 19,599
U.S. corporate debt securities |  |
Available-for-sale securities |  |
Fair value, less than 12 months | 0 | 0
Unrealized losses, less than 12 months | 0 | 0
Fair value, 12 months or longer | 2,432 | 2,175
Unrealized losses, 12 months or longer | 68 | 325
Fair Value | 2,432 | 2,175
Unrealized Losses | $ 68 | $ 325

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